Exercise depositional environments ▲53 part d mancos shale, cretaceous, road cuts along i-70 in central utah (figure 4.10) 1. what is the dominant sedimentary rock type shown in figure 4.10? 2. what does the black color suggest about the en- vironment of deposition? what additional infor- mation is provided by the types of fossils found in the mancos shale? 3. rocks of the mancos shale were most likely de- posited in which of the sedimentary environ- ments listed in table 4.1? explain your answer.